flake reorg, enable panic hook

.forgejo/workflows/nix.yaml

@@ -1,16 +1,16 @@
-name: "Build"
+name: "CI"
 on:
   pull_request:
   push:
 
 jobs:
-  build:
+  checks:
     runs-on: nix
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: https://codeberg.org/icewind/attic-action@v1
         with:
-          name: ci
-          instance: https://cache.icewind.me
-          authToken: '${{ secrets.ATTIC_TOKEN }}'
-      - run: nix build
+          name: link
+          instance: https://cache.icewind.link
+          authToken: "${{ secrets.ATTIC_TOKEN }}"
+      - run: nix flake check --keep-going